>>20214381as long as you do
-vf "chromakey=0x00FF00FF:0.18:0.05" -auto-alt-ref 0
every time you encode, and make sure you use -c:v copy whenever you're not encoding, ffmpeg seems to respect the alpha channel
the main issue I had is that for a while I didn't realise mpv on osx doesn't respect the alpha channel on webms and replaces it with the same green i was trying to greenscreen out, i tried so many different chromakey options before i checked it in firefox and realised my chromakey was working the entire time
